OK, mcpbowerman asked me to do a video of a car sketch. Here is a quick sketch technique I sometimes use. This sketch took 20 minutes. After laying down an underlay to work through the perspective and the design in Sharpie, a clean sheet was put over top and a series of cool grey marker strokes laid down. Once the overall form took shape, a layer of sharpie lifework was laid overtop. A few finishing strokes of marker and colored pencil, and a fast but communicative sketch is complete.

Sharron, I'm glad it helped. The practice of using underlays is key to my work flow. Typically in the first pass I'm just working out the design. In the second pass I work through the perspective, then the third overlay is the final lifework to be colored up.

Using underlays is something that I tend not to do unless I'm working on an exploded sketch or something of that nature, but I can see it definitely helps to get the initial design down and then use overlays to finalise.